The document discusses different types of input and output devices for computers including keyboards, mice, scanners, printers, monitors and describes their main features and functions. It also covers audio/video devices like speakers, microphones, media players and technologies like mobile TV. Finally, it mentions devices that combine input and output capabilities such as fax machines, multifunction devices, and internet telephones.

1. choicse
1. D
2. B
3. A
4. C
5. d
6. a
7. c
8. c
9. a
10. d
Match
1. i
2. E
3. H
4. g
5. j
6. b
7. c
8. a
9. f
10. d
open-ended
1. Input : is any datd or instructions used by a computer.
Input devices :translate words , images , and actions into a form a computer can
process.
2. Keyboards : are the most common way to input data . common types are
traditional , ergonomic , wireless , PDA , and virtual .
Pointing devices : accept pointing gestures and convert them to machine –
readable input .
Scanning devices : scanners move across text abd graphics . scanning devices
convert scanned text abd images into a form that can be processed by the
system unit .
Image capturing devices : create or capture original images.
Audio input devices :convert sounds into a form that can be processed by the

2. system unit .
3. Output : is data or information processed by a computer .
Output devices : translate processed text, graphics,audio ,video into a form
humanes can understand.
4. Features of Monitord :
1-Resolution .
2- Dot ( pixel ) pitch .
3- refresh rate .
4- Size .
5- Aspect ratio .
different types of monitors :
Flat-panel monitors : have become the standard for computer systems.
Cathode-ray tubes : used technology similar to older televisions.
Three specialized types of monitors rae e-book readers ,digital whiteboards ,
and high – definition television (HDTV ).
Features of printers :
1- Resolution.
2- Color.
3- Speed.
4- Memory.
5- Duplex printing.
different types of Printers :
Ink-jet printers :spray ink at high speed onto the surface of paper .
Laser printers : use technology similar to photo copying machines .Tow
categories are personal and shared .
Other printers include cloud printing , thermal printers ,plotters, photo
printers ,and protable printers .
5. Audio and video devices : audio – output devices translate audio information
from the computer into sounds that people can understand.
Portable media players : also known a digital media players , store and play
digital media .
Mobile DTV : technology supports television broadcasting directly to
smarphones , computers , and digital media players .
6. Many devices combine input and output capabilities.Sometimes this is done to
save space .Other times it is done for very specialized applications .
For examples :
Fax Machines : send and receive images via standard telephone lines .
Multifunctional devices: typically combine the capabilities of a scanner , printer ,
fax , and copy machine .

3. 7. Internet Telepgones : receive and send voice communication . Voice pver IP
(VOIP) , also known as telephony . Internet telephony , and IP telephony , uses
the Internet to transmit telephone calls. Four providers are
Ooma,vonage,MagicJack , and skype.